Formaldehyde hydrosulfites and process of making same.



NITED STATES Patented September 6, 1904.

PATENT OFFICE.

LOUIS DESOAMPS, OF LILLE, FRANCE.

SPECIFICATION forming part of Letters Patent No. 769,593, datedSeptember 6, 1904.

Application filed September 23, 1903. Serial No 174,377. (Specimens) To[U/ 'IU/LONI/ [1? vim/y concern.-

Be it known that I, LoUIs DESGAMPS, a citizen of the Republic of France,residing in Lille, Nord, France, haveinvented certain new and usefulImprovements in Formaldehyde i-Iydrosullites and Processes of MakingSame, of which the following is a specification.

This invention relates to a new manufacture of chemical substancesresulting from the action of a primary or secondary aldehyde oranalogous body or of any body having simple or complex aldehydicfunction upon hydrosulfites. The said new substances appear to behydrosulfite aldehydes or analogous bodies. The said bodies areobtained, for example, by causing formaldehyde to act upon an alkalineearthy or metallic hydrosulfite, whether this be in a dissolvedcondition, in the form of paste, or in the dry state. Such a body may beproduced, for instance, from twenty parts of formol at forty per cent.and eighty parts of calcium hydrosulfite at two reducing degrees-that isto say, a hydrosullite of such strength that two kilograms thereof isrequired to reduce one kilogram of pure indi gotine. The combinationproduces chemical bodies possessing new properties, and in particularhaving an extraordinary stability in the dry state and at a hightemperature.

In effect, the chemical body resulting, for example, from theabove-mentioned action of formaldehyde upon calcium hydrosulfite can bedesiccated at a temperature above 100 centigrade and in a current of hotair without being liable to decomposition. The bodies thus produceddevelop their energetic and rapid reducing and decolorizing propertiesunder the action of moist heat, such as vaporizing with or withoutpressure. They constitute very good corrosives for the discharge ofreducible coloring-matters.

The constitution of the product obtained by this invention has not yetbeen ascertained with exactness or certainty; but the formula isbelieved to be the following:

OH-OHSO. ONa

Having now particularly described and ascertained the nature of my saidinvention and the best means I know of carrying the same into practicaleffect, .1 claim 1. The herein-described method of producinghydrosulfite -formaldehyde compounds which consists in reacting withformaldehyde upon a hydrosul lite, substantially as described.

2. The hereindescribed method of producing hydrosulf'ite formaldehydecompounds which consists in reacting with formaldehyde upon analkali-metal hydrosullite, substantially as described.

3. The herein-described hydrosullite-formaldehyde compound, consistingof a h ydrosullite and formaldehyde in chemical combination, formingcolorless crystals, and characterized by the fact that it does notreduce a solution of indigo sulfonic acid at ordinary temperatures, butdoes reduce such solution at temperatures exceeding 4C0 centigrade.

In witness whereof I have hereunto signed my name, this 8th day ofSeptember, 1903, in the presence of two subscribing witnesses.

LOUIS DESOAMPS.

(Vitnesscsz J osnr u HARDING, l\TALVINA LANDRI EUS.

